COUNT API added

Author: dconeybe

firebase-firestore/src/main/java/com/google/firebase/firestore/AggregateDemo.java

@@ -0,0 +1,40 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase.firestore;
+
+import androidx.annotation.NonNull;
+
+final class AggregateDemo {
+
+  private final FirebaseFirestore db;
+
+  AggregateDemo(@NonNull FirebaseFirestore db) {
+    this.db = db;
+  }
+
+  void countBasicQuery() {
+    AggregateQuery query = db.collection("users").count();
+    AggregateQuerySnapshot snapshot = query.get(AggregateSource.SERVER_DIRECT).getResult();
+    assertEqual(snapshot.getCount(), 50);
+  }
+
+  void countLimitNumRowsScanned() {
+    AggregateQuery query = db.collection("users").limit(11).count();
+    AggregateQuerySnapshot snapshot = query.get(AggregateSource.SERVER_DIRECT).getResult();
+    assertEqual(snapshot.getCount(), 11);
+  }
+
+  private static void assertEqual(Object o1, Object o2) {}
+}

firebase-firestore/src/main/java/com/google/firebase/firestore/AggregateQuery.java

@@ -0,0 +1,43 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase.firestore;
+
+import androidx.annotation.NonNull;
+import com.google.android.gms.tasks.Task;
+
+public class AggregateQuery {
+
+  AggregateQuery() {}
+
+  @NonNull
+  public Query getQuery() {
+    throw new RuntimeException("not implemented");
+  }
+
+  @NonNull
+  public Task<AggregateQuerySnapshot> get(@NonNull AggregateSource source) {
+    throw new RuntimeException("not implemented");
+  }
+
+  @Override
+  public int hashCode() {
+    throw new RuntimeException("not implemented");
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    throw new RuntimeException("not implemented");
+  }
+}

firebase-firestore/src/main/java/com/google/firebase/firestore/AggregateQuerySnapshot.java

@@ -0,0 +1,48 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase.firestore;
+
+import androidx.annotation.Nullable;
+import javax.annotation.Nonnull;
+
+public class AggregateQuerySnapshot {
+
+  AggregateQuerySnapshot() {}
+
+  @Nonnull
+  public AggregateQuery getQuery() {
+    throw new RuntimeException("not implemented");
+  }
+
+  @Nullable
+  public Long getCount() {
+    throw new RuntimeException("not implemented");
+  }
+
+  @Override
+  public boolean equals(@Nullable Object obj) {
+    throw new RuntimeException("not implemented");
+  }
+
+  @Override
+  public int hashCode() {
+    throw new RuntimeException("not implemented");
+  }
+
+  @Override
+  public String toString() {
+    throw new RuntimeException("not implemented");
+  }
+}

firebase-firestore/src/main/java/com/google/firebase/firestore/AggregateSource.java

@@ -0,0 +1,19 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase.firestore;
+
+public enum AggregateSource {
+  SERVER_DIRECT,
+}

firebase-firestore/src/main/java/com/google/firebase/firestore/Query.java

@@ -1223,6 +1223,11 @@ private void validateHasExplicitOrderByForLimitToLast() {
     }
   }
 
+  @NonNull
+  public AggregateQuery count() {
+    throw new RuntimeException("not implemented");
+  }
+
   @Override
   public boolean equals(Object o) {
     if (this == o) {